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Finding the Fourth Proportional to 18,990.90, 28,477.69 and 7,890.96

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Solution

The fourth proportional to 18,990.90, 28,477.69 and 7,890.96 is: 11,832.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.90 : 28,477.69 = 7,890.96 : x
  2. Step 2: Convert to fraction form
    18,990.90/28,477.69 = 7,890.96/x
  3. Step 3: Cross multiply
    18,990.90x = 28,477.69 × 7,890.96
  4. Step 4: Simplify right side
    18,990.90x = 224,716,312.68
  5. Step 5: Solve for x
    x = 224,716,312.68/18,990.90
  6. Step 6: Final answer
    x = 11,832.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.